Yankee Group reports that one major Internet service provider spends more than $5 million annually on disk storage for spam.
Symantec found that a company of 100 employees suffers an average of more than $250,000 in productivity lost to handling spam.
Ferris Research estimates the total lost productivity cost to the U.S. economy is $4 billion,
Ferris Research estimates $3.7 billion is spent on systems and personnel needed to deal with problems caused by spam.
Jupiter Research predicts that spending on direct marketing e-mail campaigns will increase from $1.4 billion in 2002 to $8.3 billion by 2007.